For generations, grey hair has been treated as nothing more than a cosmetic inconvenience, something to dye over, joke about, or blame on a stressful year. But a study out of the University of Tokyo suggests those grey strands may actually be evidence of the body doing its job. Published in the journal Nature Cell Biology , the research, led by Professor Emi Nishimura and Assistant Professor Yasuaki Mohri, followed pigment-producing stem cells inside hair follicles in mice and tracked how they respond when their DNA is damaged. What the team found reframes hair graying not as simple wear-and-tear, but as one possible outcome of a much bigger biological fork in the road.
